Pilot-operated three-way two-position solenoid valves, on-off operation whenever they receive an electrical signal. They are used in circuits where it is necessary to interrupt, open or divert the flow of oil using an electrical control.Pilot-operated three-way two-position solenoid valves, on-off operation whenever they receive an electrical signal. They are used in circuits where it is necessary to interrupt, open or divert the flow of oil using an electrical control.